feat: add reverse proxy support with HTTPS configuration

musicround/helpers/auth_helpers.py

@@ -344,4 +344,14 @@ def update_oauth_tokens(user, tokens, auth_provider):
     except Exception as e:
         db.session.rollback()
         current_app.logger.error(f"Error updating {auth_provider} tokens: {str(e)}")
-        return False
+        return False
+
+def get_oauth_redirect_uri(endpoint, provider=None):
+    """
+    Generate OAuth redirect URI with proper scheme handling for reverse proxy environments
+    """
+    # Use Flask's url_for which respects PREFERRED_URL_SCHEME
+    if provider:
+        return url_for(endpoint, provider=provider, _external=True)
+    else:
+        return url_for(endpoint, _external=True)

musicround/helpers/dropbox_helper.py

@@ -2,6 +2,7 @@
 Helpers for Dropbox API integration
 """
 from flask import current_app, url_for, redirect, session
+from musicround.helpers.auth_helpers import get_oauth_redirect_uri
 import requests
 import json
 import os
@@ -11,7 +12,7 @@ from flask_login import current_user
 def get_dropbox_auth_url():
     """Get the authorization URL for Dropbox OAuth flow"""
     app_key = current_app.config.get('DROPBOX_APP_KEY')
-    redirect_uri = url_for('users.dropbox_callback', _external=True)
+    redirect_uri = get_oauth_redirect_uri('users.dropbox_callback')
     
     # Add the required scopes for our application
     scopes = ["files.content.read", "files.content.write", "sharing.write","account_info.read"]
@@ -23,7 +24,7 @@ def exchange_code_for_token(code):
     """Exchange the authorization code for an access token"""
     app_key = current_app.config.get('DROPBOX_APP_KEY')
     app_secret = current_app.config.get('DROPBOX_APP_SECRET')
-    redirect_uri = url_for('users.dropbox_callback', _external=True)
+    redirect_uri = get_oauth_redirect_uri('users.dropbox_callback')
     
     data = {
         'code': code,